Getting the exhaust off and on can be frustrating, and is the hardest part. When you reinstall it, you've got to line it up to the studs on the head while keeping the exhaust gasket in place, and supporting all the weight in the back.
There's also a specific order you should tighten things down so all the bolts line up and don't leak at the head: stud nuts a bit loose at the head, get the mounting bolts just started, tighten down the stud nuts, tighten down the mounting bolts.
On the People 250, plastic removal was necessary to remove the top bolt of the shock which was very annoying.